The secrecy capacity per-unit cost of the Gaussian MIMOME
channel is the maximum achievable number of bits per unit cost
that can be transmitted reliably to the legitimate receiver
while leaking asymptotically no information to the
eavesdropper. Assuming that a zero cost is assigned to one
symbol of the input alphabet and that the eavesdropper channel
is known to both sender and legitimate receiver, we derive a
single letter expression for the secrecy capacity per-unit cost
for the MIMOME channel.